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5.2 Using gain and offset in a program
I/O characteristics of the FX-2DA can be adjusted by changing the gain and offset parameters. These can
be changed by the switches of the FX-2DA with the aid of Voltage & Current meters or simply changed by
writting these settings from the programmable controller.
Only the gain and offset values in the memory of the FX-2DA need be adjusted. A voltmeter or an ammeter
for the analog output is not needed. A program for the programmable controller will be needed however.
The following is an example; changing the offset value to 0mA and gain value to 20mA on output channel
CH2 of the FX-2DA connected as block No.1.
Example: Adjusting gain/offset via software settings
X010
M0
TO(P)
K1
K0
TO(P)
K1
K21
TO
K1
K22
T0
TO(P)
K1
K23
TO(P)
K1
K24
TO(P)
K1
K22
T1
TO(P)
K1
K21
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Adjustment start.
SET
M0
(H10) → BFM #0 (initialize input channels)
H10
K1
In the program shown at left, the programmable
controller should be in RUN status, and MODE
switch of the FX-2DA in the READY position.
(K1) → BFM #21
K1
K1
BFM #0 should be of HEX value H10, and (b1,
b0) of BFM #21 should be (0, 1).
(K0) → BFM #22 (offset/adjust)
K0
K1
Reset adjust bits.
T0
K4
(K0) → BFM #23 (offset)
This statement may be omitted if BFM #23 is already
K0
K1
at its default value.
(K20000) → BFM #24 (gain)
K20000
K1
(HC) → BFM #22 (offset/gain set)
A delay of 300ms may be needed between setting
HC
K1
BFM #0 and #22 (see section 3.4 "caution" )
RST
M0
Adjustment end.
(K2) → BFM #21
K2
K1
BFM #21 gain/offset adjust prohibit.
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